Pump



C. A. CRIQUI AND E. T. LABKIN.

PUMP.

APPLICATION FlLED JAN. 22, 1919.v

Patented May 11, 1920.

2 SHEETS- SHEET l.

UNITED sri-iras PATENT OFFICE.

CHARLES A.l CRIQUI AND ELwooD fr. LAaKnL or BUFNLLO,` NEW YORK; sAID LARKIN Assrerivorv To sArD emaux.

PUMP.

Specification of Letters latent. Patented DIay 11, A1920. l

Application filed January 22, 1919. Serial No. 272,410.

To all whom t may concern:

Be it known that we, CHARLES A. CRIQUI and.l ELwooD T. LARKIN, citizens of the United States, residing in Buffalo, in the county of Erie and State of New York, have invented new and useful Improvements in Pumps, of which the following is a. specilication.

This invention relates to a pump which is more particularly designed for pumping gasolene or similar fluids or liquids.

As is well known great difficulty is ex-l perienced in pumping gasolene by' means of the conventional forms of pumps now in general use 'owing to the difliculty in keeping the working parts of the pump which come in Contact with the gasolene properly lubricated, thereby causing .leakage of the gasolene which results in loss of material and reduced eiiiciencfv and also endangers life and property.

lt is the object of this invention to produce a pump for transporting gasolene or similar fluids which will not leak and which can be safely used in closed compartments without liability of accumulating dangerous fumes therein and insuring. greater economy and efficiency'.

In the accompanying drawings:

Figure 1 is a vertical longitudinalv section of one form of our improved pump showing the" same applied to the base of a marine gas engine. Fig. 2 is a vertical transverse section of the same taken on line 2 2, Fig. 1.

Similar characters of reference refer to like parts in both views.v

Although our invention may be embodied in a variety of forms to suit different installations, that shown in the drawings, as an example, has been found practical in actual use and as there shown is constructed as follows: y

40 represents a pumping chamber. one Wall 2 of which is constructed ofrigid material suchas cast metal while another wall 2 of the same is constructed in the form of a flexible diaphragm which can be vibrated laterally for producing an alternate suction `and expelling effect within the pumping chamber.

This pumping chamber 1s provided with an inlet passage 3 which is connected by means of. a pipe or conduit 4 ywith any suitable source from which. the gasolene or other fluid to be pumped is supplied.

S, 9 within the valve body containing the f inlet passage. This pumping chamber `ris also provided with an outlet passage 10 which is connected with a delivery pipe'll leading to the place intended to receive the gasolene or other fluid. Backward movey ment from this delivery pipe into the pumping chamber is prevented-by a check valve which preferably comprises two balls 12, 13 of different diameters arranged within the outlet passage formed in the valve body 1-1 and provided with valve seats 1:7. 16 of different sizes which are engaged by the balls l2. 13.

Upon 'drawing the diaphragm laaway from its companion rigid wall 2 a suction is produced within the pumping chamber which causes liquid to be drawn through the inlet pipe past the inlet check valve into the pumping chamber and upon moving the diaphragm toward its companion rigid. wall the liquid contents of the pump chamber are expelled therefrom past the outlet check valve andv through the delivery-pipe.

()ur invention relates more partici'ilarly to the means whereby this diaphragm is vibrated and in the .preferred form shown in the drawings these means are constructed as follows:

1T represents an actuating chamber which is arranged on that side of the diaphragm opposite to the pump chamber. This actuating chamber has that wall 18 opposite the diaphragm constructed of rigid material such as cast metal and the diaphragm is clamped at its edge between opposing ma'rthe diaphragm.- Although the details of the means lwhereby this is accomplished may be variedtlio'se which areshown in the drawings are preferred and are constructed yas l follows 20represents a pump barrel which opens atitsl rear end into the reservoir and has its *front end connectedby an inlet passage 22 with the actuating chamber preferably the lowerI party of the latter, whileth'e central part of the pump barrelr aboutmidway be-L tween its front and rear ends communicates by means ofV a portor intake lpassage 21 with the lowerypart ofthe liquid reservoir. Within the pump vloana isarmnged a 15011- gitidhally 'repfrecating plunger 23 .which 'be actuated in any suitable manner,l for instance7 bymeans ofa crankshaft 2% 1l journaled in a `bearing 25 on one side of the reservoir andprovided within the lat-r ter with. a crank. 27 which has its wrist pin?.

26,'.connected by means of a pit'rnan or con-y nwtngmd 23 'with the Pill-11p plunger ThiS Creilkhfff may be" turned in any' 'approvedl mannerand froml lany suitable source but as' 'shjown in the drawings this is accom? pli'shed lmeans 'of a pulley 29 secured to y the shaft outside ef the reservoir and adapt- .ed to receiveya driving belt. The oil is -`sup-v plied .tothe reservoir from any suitable source, for instance, by a pipe 3l) forming part of the oil pressure line of the engine.

with which this pump is associated which supply pipe y,opens into the vupper part of the reservoir; any'fexcesso'il delivered into ythe latter being discharged through an outlety opening 31 at the top of the lleservoir` into the crank ,case v39 of the en' ine where the saineI `is again picked pby te usual lubricating.` pumping mechanism and delivered tothe variou's places. of the engine which require oil,`V

Leading from the(actuatingchamberto the yreservoir is an overflow or relief passage 32 whichlpreferablyconnects the upper` parts of this chamber and reservoir. In this against the back of the check valve 33 while its other end` bears against a screw 36 engaging with a threaded opening in the adj acent .part of the wall of the overflow passage. In order to guide the rear or inner end of theconnecting rod- 23 and confine the same properly in engagement with the crank pin or wrist 26 of the crank shaft, the other end of the connecting rod is confined bethe same covers the supply port so that no further oil passesfrom the 'reservoirinto the pump barrel.v During the continued. for. ward or downward 'movement yof they plunger the oil `or liquid contained inthe lower part of the pump barrel is forced out ofthe samel and through the1 inlet passage 22 into theactuating chamber 17 inwhich latter a pressure is developed which causesthe diaf phragm 1 to be forced towardl therigid wall .of the' pump chamber and thereby ex: pel the li, uid contents from the pumping chamber through the outlet thereof., 'The capacity ofthe y,pump is preferably so. de,- terinine'd that a larger chargcor quantity of oil is forced from the pump ,barrel into the actuating chamber than is necessary to force the diaphragm the proper distance toward the pumping chamber and such excess oil` under the pressure of the plunger causes the overflow orrelief valve 33 to be lifted in opposition to the resistanceof its spring and permit the excess oil to pass from the4 actuatingchamber into the oil reservoir.. During 'the backward or return stroke/fof the..

pump plunger the check valve 33,;inthe overflow passage is closed so that an ex? hausting effect is produced upon the oil within the actuating chamber which operatesto draw the IdiaphragminwardlyI relative'l to the actuating Chamberand outwar ly relatively to the pumpingv chamber, whereby additional gasolene is "drawn through the supply pipe into the pumping chamber preparatory to expelling the same therefrom during 'the next outward deflection of the diaphragm wheny theplunger makes its ynext `following forward stroke. This :exhausting effect upon the .actuating chamber continues fromV the beginning of the rearward stroke of the plunger until the latter has uncovered the supply port 2li.

after which the 4suction of this plunger isbroken and additional oil is permitted to pass from the reservoirinto the'p'ump bar, rel. This operation is repeated during each forward and backward movement of the plunger so that when the pump is in normal operation a continued pulsating or vibrating action is produced upon the diaphragm which has the effect of causing the latter to alternately draw yliquid into the pumping chamber then expelling the same therefrom,

ioo

By so proportioning the capacity of the pump barrel and plunger relatively to the actuating chamber that a greater amount of oil is delivered to the actuating chamber during each stroke of the plunger than is necessary for moving the diaphragm to its maximum extent toward the pumping chamber and permitting the excess quant-ity of oil to pass the spring pressed check valve into the reservoir, uniformity in the o )eration of the diaphragm is insured at all gardless of any slight variation in the quantity of oil in the reservoir and also insuring a uniform pressure on the oil which operates upon the diaphragm. By alternately covering and uncovering the inlet port 21 the` pump plunger serves the double function of an intake valve which controls the admission of oil from the reservoir into the pump barrel and also as the means for forcing the oil into the actuating chamber and withdrawing the same therefrom. The level of the oil is preferably maintained at such a height that the pump plunger and its connection with the crank shaft are constantly submerged in oil, thereby not only keeping the same constantly lubricated and reducing the wear thereon, but also eliminating the passage of any air between the pump barrel and plunger and the loss of efficiency which otherwise would occur if there were ang leakage between these elements.

y thus operating. the diaphragm by liquid shifting meansthe movable parts of which at no time come in contact with the gasolene whichfis being pumped, leakage of gasolene is positively prevented from any of the conduits into adjacent compartments, thereby effectually eliminating all danger from fumes and safeguarding the health of the operators as well as avoiding loss from accidents which might occur if such leakage were possible.

This pumping apparatus is very simple and compact in construction, it can be readily installed where a limited amount of room Y is available and it can be readily operated with a minimum expenditure of power.

Furthermore, this pump avolds exposing any pump plungers, ears, bearings, or packings to the action o gasolene which would be liable to cause the same to leak,- it is more positive inits action than a pump which employs a plunger exposed to gasolene,l or

one in which a vacuum tank is employed.

We claim as our invention:

1. A pump comprising a pumping cham-- ber having an inlet and an outlet, an actuating chamber having a supply passage and an overflow passage, i a flexible diaphragm arranged between said pumping and'actuating rhambera a pump barrelhaving its front part communicating with said supply passage and its rear part communicating with said overflow passage. and a pump plunger reciprocating in said barrel.

2. A pump comprising a pumpingchamber having an inlet and an outlet, an actuating chamber having a supply passage and an overflow passage, a flexible diaphragm arranged between said pumping and actuating Chambers, a check valve arranged in said overflow passage, a pump barrel having its 'front part communicating with said supply passage, and its rear part communicating with said overflow passage and a pump plunger reciprocating in said barrel.

3. A pump comprising a pumping cham- A ber having an inlet and an outlet, an actuating chamber having a supply passage and an overflow passage, a flexible d1aphragm arranged between said pumping and actuat-l ing chambers, a check valve arranged in said overflow passage, a pump barrel having its front part communicating with said supply passage and communicating in the side of its rear part by a port with said overflow passage, and a pump plunger reciprocating in said barrel and adapted to alternately cover and uncover said port.

4. A pump comprising a pumpingcham- -ber having an inlet and an outlet, an actuating chamber having a supply passage and an overflow passage, a flexible diaphragm arranged between said pumping and actuating chambers, a check valve arranged in said overflow passage, a pump barrel having its front part communicating with said supply passage, and communicating in the side of its rear part by a port with said overflow passage, a pump plunger reciprocating in said barrel and adapted to alternately cover and uncover said port, andA a crank shaft having its crank connected with said plunger.

5. A pump comprising a pumping chamber havinnr an inlet and an outlet, an actuating chamber having a supply passage and an overflow passage, a flexible diaphragm arranged between said pumping and actuating chambers, a vcheck valve arranged in said overflow passage, a reservoir communicating .with said overflow passage, a pump bar-1 rel having its front part communicating with said supply assage and communicating in the side of) its rear part by a port with said reservoir, a pump plun fer recipf rocating in said barrel and adapte( to alternately cover and uncover said port, and means4 for supplying fluid to said reservoir and discharging the surplus fluid therefrom.

. CHARLES A. CRIQUI. ELWOOD T. LARKIN. 

